15 lines
304 B
Rust
15 lines
304 B
Rust
// revisions: current next
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//[next] compile-flags: -Znext-solver
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struct Wrapper<T: ?Sized>(T);
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trait A: B {}
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trait B {}
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fn test<'a>(x: Box<Wrapper<dyn A + 'a>>) -> Box<Wrapper<dyn B + 'a>> {
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x
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//~^ ERROR cannot cast `dyn A` to `dyn B`, trait upcasting coercion is experimental
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}
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fn main() {}
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